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31 ******************************************************************************/
32 /*****************************************************************************/
37 * This file contains functions related to CAN interrupt handling.
40 * MODIFICATION HISTORY:
42 * Ver Who Date Changes
43 * ----- ----- -------- -----------------------------------------------
44 * 1.00a xd/sv 01/12/10 First release
45 * 3.00 kvn 02/13/15 Modified code for MISRA-C:2012 compliance.
48 ******************************************************************************/
50 /***************************** Include Files *********************************/
54 /************************** Constant Definitions *****************************/
56 /**************************** Type Definitions *******************************/
58 /***************** Macros (Inline Functions) Definitions *********************/
60 /************************** Variable Definitions *****************************/
62 /************************** Function Prototypes ******************************/
64 /****************************************************************************/
67 * This routine enables interrupt(s). Use the XCANPS_IXR_* constants defined in
68 * xcanps_hw.h to create the bit-mask to enable interrupts.
70 * @param InstancePtr is a pointer to the XCanPs instance.
71 * @param Mask is the mask to enable. Bit positions of 1 will be enabled.
72 * Bit positions of 0 will keep the previous setting. This mask is
73 * formed by OR'ing XCANPS_IXR_* bits defined in xcanps_hw.h.
79 *****************************************************************************/
80 void XCanPs_IntrEnable(XCanPs *InstancePtr, u32 Mask)
84 Xil_AssertVoid(InstancePtr != NULL);
85 Xil_AssertVoid(InstancePtr->IsReady == XIL_COMPONENT_IS_READY);
88 * Write to the IER to enable the specified interrupts.
90 IntrValue = XCanPs_IntrGetEnabled(InstancePtr);
91 IntrValue |= Mask & XCANPS_IXR_ALL;
92 XCanPs_WriteReg(InstancePtr->CanConfig.BaseAddr,
93 XCANPS_IER_OFFSET, IntrValue);
96 /****************************************************************************/
99 * This routine disables interrupt(s). Use the XCANPS_IXR_* constants defined in
100 * xcanps_hw.h to create the bit-mask to disable interrupt(s).
102 * @param InstancePtr is a pointer to the XCanPs instance.
103 * @param Mask is the mask to disable. Bit positions of 1 will be
104 * disabled. Bit positions of 0 will keep the previous setting.
105 * This mask is formed by OR'ing XCANPS_IXR_* bits defined in
112 *****************************************************************************/
113 void XCanPs_IntrDisable(XCanPs *InstancePtr, u32 Mask)
117 Xil_AssertVoid(InstancePtr != NULL);
118 Xil_AssertVoid(InstancePtr->IsReady == XIL_COMPONENT_IS_READY);
121 * Write to the IER to disable the specified interrupts.
123 IntrValue = XCanPs_IntrGetEnabled(InstancePtr);
125 XCanPs_WriteReg(InstancePtr->CanConfig.BaseAddr,
126 XCANPS_IER_OFFSET, IntrValue);
129 /****************************************************************************/
132 * This routine returns enabled interrupt(s). Use the XCANPS_IXR_* constants
133 * defined in xcanps_hw.h to interpret the returned value.
135 * @param InstancePtr is a pointer to the XCanPs instance.
137 * @return Enabled interrupt(s) in a 32-bit format.
141 *****************************************************************************/
142 u32 XCanPs_IntrGetEnabled(XCanPs *InstancePtr)
145 Xil_AssertNonvoid(InstancePtr != NULL);
146 Xil_AssertNonvoid(InstancePtr->IsReady == XIL_COMPONENT_IS_READY);
148 return XCanPs_ReadReg(InstancePtr->CanConfig.BaseAddr,
153 /****************************************************************************/
156 * This routine returns interrupt status read from Interrupt Status Register.
157 * Use the XCANPS_IXR_* constants defined in xcanps_hw.h to interpret the
160 * @param InstancePtr is a pointer to the XCanPs instance.
162 * @return The value stored in Interrupt Status Register.
166 *****************************************************************************/
167 u32 XCanPs_IntrGetStatus(XCanPs *InstancePtr)
169 Xil_AssertNonvoid(InstancePtr != NULL);
170 Xil_AssertNonvoid(InstancePtr->IsReady == XIL_COMPONENT_IS_READY);
172 return XCanPs_ReadReg(InstancePtr->CanConfig.BaseAddr,
176 /****************************************************************************/
179 * This function clears interrupt(s). Every bit set in Interrupt Status
180 * Register indicates that a specific type of interrupt is occurring, and this
181 * function clears one or more interrupts by writing a bit mask to Interrupt
184 * @param InstancePtr is a pointer to the XCanPs instance.
185 * @param Mask is the mask to clear. Bit positions of 1 will be cleared.
186 * Bit positions of 0 will not change the previous interrupt
187 * status. This mask is formed by OR'ing XCANPS_IXR_* bits defined
192 *****************************************************************************/
193 void XCanPs_IntrClear(XCanPs *InstancePtr, u32 Mask)
197 Xil_AssertVoid(InstancePtr != NULL);
198 Xil_AssertVoid(InstancePtr->IsReady == XIL_COMPONENT_IS_READY);
201 * Clear the currently pending interrupts.
203 IntrValue = XCanPs_IntrGetStatus(InstancePtr);
205 XCanPs_WriteReg(InstancePtr->CanConfig.BaseAddr, XCANPS_ICR_OFFSET,
209 /*****************************************************************************/
212 * This routine is the interrupt handler for the CAN driver.
214 * This handler reads the interrupt status from the ISR, determines the source of
215 * the interrupts, calls according callbacks, and finally clears the interrupts.
217 * Application beyond this driver is responsible for providing callbacks to
218 * handle interrupts and installing the callbacks using XCanPs_SetHandler()
219 * during initialization phase. An example delivered with this driver
220 * demonstrates how this could be done.
222 * @param InstancePtr is a pointer to the XCanPs instance that just
229 ******************************************************************************/
230 void XCanPs_IntrHandler(void *InstancePtr)
234 XCanPs *CanPtr = (XCanPs *) ((void *)InstancePtr);
236 Xil_AssertVoid(CanPtr != NULL);
237 Xil_AssertVoid(CanPtr->IsReady == XIL_COMPONENT_IS_READY);
239 PendingIntr = XCanPs_IntrGetStatus(CanPtr);
240 PendingIntr &= XCanPs_IntrGetEnabled(CanPtr);
243 * Clear all pending interrupts.
244 * Rising Edge interrupt
246 XCanPs_IntrClear(CanPtr, PendingIntr);
249 * An error interrupt is occurring.
251 if (((PendingIntr & XCANPS_IXR_ERROR_MASK) != (u32)0) &&
252 (CanPtr->ErrorHandler != NULL)) {
253 CanPtr->ErrorHandler(CanPtr->ErrorRef,
254 XCanPs_GetBusErrorStatus(CanPtr));
256 * Clear Error Status Register.
258 XCanPs_ClearBusErrorStatus(CanPtr,
259 XCanPs_GetBusErrorStatus(CanPtr));
263 * Check if any following event interrupt is pending:
265 * - RX FIFO Underflow
266 * - TX High Priority Buffer full
268 * - Wake up from sleep mode
270 * - Enter Bus off status
271 * - Arbitration is lost
273 * If so, call event callback provided by upper level.
275 EventIntr = PendingIntr & ((u32)XCANPS_IXR_RXOFLW_MASK |
276 (u32)XCANPS_IXR_RXUFLW_MASK |
277 (u32)XCANPS_IXR_TXBFLL_MASK |
278 (u32)XCANPS_IXR_TXFLL_MASK |
279 (u32)XCANPS_IXR_WKUP_MASK |
280 (u32)XCANPS_IXR_SLP_MASK |
281 (u32)XCANPS_IXR_BSOFF_MASK |
282 (u32)XCANPS_IXR_ARBLST_MASK);
283 if ((EventIntr != (u32)0) && (CanPtr->EventHandler != NULL)) {
284 CanPtr->EventHandler(CanPtr->EventRef, EventIntr);
286 if ((EventIntr & XCANPS_IXR_BSOFF_MASK) != (u32)0) {
288 * Event callback should reset whole device if "Enter
289 * Bus Off Status" interrupt occurred. All pending
290 * interrupts are cleared and no further checking and
291 * handling of other interrupts is needed any more.
295 /*This else was made for misra-c compliance*/
301 if (((PendingIntr & (XCANPS_IXR_RXFWMFLL_MASK |
302 XCANPS_IXR_RXNEMP_MASK)) != (u32)0) &&
303 (CanPtr->RecvHandler != NULL)) {
306 * This case happens when
307 * A number of frames depending on the Rx FIFO Watermark
308 * threshold are received.
309 * And also when frame was received and is sitting in RX FIFO.
311 * XCANPS_IXR_RXOK_MASK is not used because the bit is set
312 * just once even if there are multiple frames sitting
315 * XCANPS_IXR_RXNEMP_MASK is used because the bit can be
316 * set again and again automatically as long as there is
317 * at least one frame in RX FIFO.
319 CanPtr->RecvHandler(CanPtr->RecvRef);
323 * A frame was transmitted successfully.
325 if (((PendingIntr & XCANPS_IXR_TXOK_MASK) != (u32)0) &&
326 (CanPtr->SendHandler != NULL)) {
327 CanPtr->SendHandler(CanPtr->SendRef);
332 /*****************************************************************************/
335 * This routine installs an asynchronous callback function for the given
339 * HandlerType Callback Function Type
340 * ----------------------- ------------------------
341 * XCANPS_HANDLER_SEND XCanPs_SendRecvHandler
342 * XCANPS_HANDLER_RECV XCanPs_SendRecvHandler
343 * XCANPS_HANDLER_ERROR XCanPs_ErrorHandler
344 * XCANPS_HANDLER_EVENT XCanPs_EventHandler
346 * HandlerType Invoked by this driver when:
347 * -------------------------------------------------------------------------
348 * XCANPS_HANDLER_SEND A frame transmitted by a call to
349 * XCanPs_Send() has been sent successfully.
351 * XCANPS_HANDLER_RECV A frame(s) has been received and is sitting in
354 * XCANPS_HANDLER_ERROR An error interrupt is occurring.
356 * XCANPS_HANDLER_EVENT Any other kind of interrupt is occurring.
359 * @param InstancePtr is a pointer to the XCanPs instance.
360 * @param HandlerType specifies which handler is to be attached.
361 * @param CallBackFunc is the address of the callback function.
362 * @param CallBackRef is a user data item that will be passed to the
363 * callback function when it is invoked.
366 * - XST_SUCCESS when handler is installed.
367 * - XST_INVALID_PARAM when HandlerType is invalid.
370 * Invoking this function for a handler that already has been installed replaces
371 * it with the new handler.
373 ******************************************************************************/
374 s32 XCanPs_SetHandler(XCanPs *InstancePtr, u32 HandlerType,
375 void *CallBackFunc, void *CallBackRef)
378 Xil_AssertNonvoid(InstancePtr != NULL);
379 Xil_AssertNonvoid(InstancePtr->IsReady == XIL_COMPONENT_IS_READY);
381 switch (HandlerType) {
382 case XCANPS_HANDLER_SEND:
383 InstancePtr->SendHandler =
384 (XCanPs_SendRecvHandler) CallBackFunc;
385 InstancePtr->SendRef = CallBackRef;
386 Status = XST_SUCCESS;
389 case XCANPS_HANDLER_RECV:
390 InstancePtr->RecvHandler =
391 (XCanPs_SendRecvHandler) CallBackFunc;
392 InstancePtr->RecvRef = CallBackRef;
393 Status = XST_SUCCESS;
396 case XCANPS_HANDLER_ERROR:
397 InstancePtr->ErrorHandler =
398 (XCanPs_ErrorHandler) CallBackFunc;
399 InstancePtr->ErrorRef = CallBackRef;
400 Status = XST_SUCCESS;
403 case XCANPS_HANDLER_EVENT:
404 InstancePtr->EventHandler =
405 (XCanPs_EventHandler) CallBackFunc;
406 InstancePtr->EventRef = CallBackRef;
407 Status = XST_SUCCESS;
411 Status = XST_INVALID_PARAM;